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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b28c65ce1307f2a1d09cf984213d656e1c25b9de9bc4570e7ba248e953c8e7e' 
  AND token = 'Oldj4+huLsZFEjE4kO+xbdL760vhT+bOJ5bXnlBvjHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}